Separator



T. J. S-TURTEVANT.

SEPARATOR.

APPLICATION FILED NOV. 10. 1917.

1,400,467. Patented Dec. 13, 1921 3- SHEETSSHEET I.

T. J. STURTEVANT.

SEPARATORA APPLICATION FILED NOV:10, 1917.

1,400,467. Patented DEG-13, 1921.

T. J. STURTEVANT.

SEPARATOR.

APPLICAHON F|LED NOV 10. 1917.

1,400,467. Patented Dec. 13,1921.

BSHEETS-SHEET 3- THOMAS J. STUBTEVMTT OF XUELLEESLEY, MASSACHUSETTS, ASSIG-NOR TO STURT E- VAN! MILL COMPANY, OF BDSTGN MA.

onnsnrrs.

SEACHUSETTS, A CUBPORATION OF MASSA- SEEAR-ATOR.

Specification of LettersPatent.

Patented Dec.13, 1921..

Application filed November 10, 191?. Serial No. 201,206.

T 0 all whom it may concern.

Be it knownthat L THOMAS J. Brown- VANT, a citizen of the United States, residing at Vilellesley, county of-Norfolk, and State of Massachusetts, have invented an Improvement in Separators, of which the following description, in connection with the accomthe efiicient screening of said materials.

These screens have been reciprocated by eccentrics, a palr belng provided for each screen located at opposite SlClGS of the screen.

'This arrangement has been found objectionable since among other reasons, they add to the overall width of the separator; it is difficult to adjust the eccentrics on their shafts and so connect the eccentricswith the opposite sides of the screen that equal movements will be given to said sides without skewing the, screen; and the use of pairs of eccentrics adds objectionably to the cost of the construction,' assembly and maintenance of the separator. Also, the rack and vibration which the screens necessarily experience induces lateral vibrations in theeccentric rods, causing a continuous lateral fiexion of the rods which tends to break them at their points of connection with the eccentrics.

The present invention provides a simple and effective eccentric mechanism for reciprocating the screens whereby the aforesaid objections are overcome.

The character of the invention may be best understood by reference to the following description of one good form thereof shown in the accompanying drawings wherein Figures 1 and 2 show a vertical longitudi nal section through a separator embodying the invention; r

Fig. 3 is a broken rear elevation of the separator .with the rear wall thereof removed;

Fig. 4 is a section taken on line 4.-4 of Fig. 5 is a side elevation of the eccentric mechanism li ig. 6 is a section taken on line 6-6 of P 1 through the eccentric mechanism and the casing therefor; and

'7 is a plan of the'means connecting the ends of the connecting rods with the screens. 1

Referring to the drawing the separator shown therein as one exemplification of the invention, comprises a casing (Figs. 1 and 2) having a bottom 1, a rear end wall 3, a front end 5, sides 7 inclined from the rear to the front ends and a cover 9 which may be hinged to the casing or removable therefrom. The materials to be graded may be fed into the casing through the neck ll beneat-h the usual feed box (not shown),

Inclined screens may be mounted in the caslng to receive and grade the material delivered therein as described. In the present instance of the invention, two screens are provided including an upper screen comprising screen clothing 15 stretched on a frame 17, and a lower screen comprising screen clothing 19 stretched on a frame 21. Plates 23 secured to the sides of the frames prevent the material from flowing over the edges of the screens. The screens may be arranged in tandem, so that the material which is not graded. by the upper screen may flow along to and be graded by thelower screen. Preferably the upper screen overlaps the lower screen somewhat to prevent the material from falling between their ad jacent ends.

The screens may be supported to permit reciprocatory' movement thereof in the direction of the lengths of the screens. To accomplish this, in the present instance of the invention. each screen is provided with a'pair of brackets 27 (Fig. 4) secured to each side bar thereof and having trunnions 29 jonrnaled' in open bearingsBl in rockers having their lower ends fast on shafts 35 journaled in bearings carried by the side walls of the casing. The construction is such, that the screen may be reciprocated in the direction of the length thereof while the rockers swing slightly with a parallel motion, and if desired the screens may readily be lifted from the rockers and removed from the casing when. the cover is openedshaft.

screens, rods 44 are provided havmg their Next will be described the mechanism for reciprocating the screens. In the present instance of the invention, this mecha nism comprises a bracket or support 37 (Fig. 1) conveniently mounted on the rear end wall of the casing adjacent the upper end thereof and provided with bearings 89 in which a shaft 41 is journaled having apulley 42 thereon. Eccentrics 43 (Figs. 5 and 6) are mounted on and rotated by said To connect these eccentrics with the upper ends threaded in clamps 43 onthe eccentric straps and consisting of two parts bolted together. The clamps grip the threaded portions ofthe rods and also grip portions 43 thereof spaced from said threaded portions; the construction being such, that flexion of the rods at the juncture of the threaded portions with the clamps and breaking of the rods thereat are prevented. The rods project through openings in the rear end walls of the casing and thence downward beneath and substantially parallel to the screens. The lower ends of these rods project through holes in U shaped brackets 45 (Fig. 7) secured to and depending from longitudinal bars 17 and 21 of the screens located intermediate the side bars thereof, and preferably near the overlapping ends of the screens. To transmit cushioned thrusts from the rods to the screens, each rod may have a pair of coil springs 47 thereon engaging the opposite faces of its bracket and confined by nuts 49 threaded onto said rod.

To eliminate or reduce the vibration of the separator from the reciprocation of the screens, the disk 51 of one of the eccentrics is set on the shaft 41 angularly in advance of the disk 53 of the other eccentric. Preferably, this angle is substantially 180. The construction is such that the screens will be simultaneously moved by the eccentrics toward each other and then simultaneously away from each other. This move; ment of the screens in opposite directions neutralizes the vibratory efi'ect thereof on the casing. For example, if the upper screen is moved downwardly and then suddenly arrested, it tends to'move the casing in the direction of the movement of the screen. If the lower screen is moved in the same direction as the upper screen, it will amplify the tendency of said movement of the casing. W On the other hand, if the lowerscreen is moved in the opposite direction to the movement of the upper screen and simultaneously therewith, the casing tends to move in the opposite direction, and the two tendencies neutralize one another.

.Preferably, the mass of one screen and the moving parts associated therewith is substantially' equal to the mass of the other screen and the parts associated therewith,

conducting the oil to said eccentrics.

and since the extent of movement of the screens is the same, the forces set up by the momentum of the screens are substantially equal and substantially neutralize each other. V c

The overlap of the upper screen with respect to the lower screen should be sufficient to prevent a gap between the two when the screens are at the limits of: their reciprocation away from one another'to prevent material from falling between them. To vary t .is overlap, the connecting rod for the upper screen may be made in two sections connected by a turn-buckle 55 (Fig. 1).

To protect the eccentrics, they may be incased in a split housing 57, theparts of which are detachably connected by screw bolts59. To lubricate the eccentrics, oil cups 61 (Fig. 3) may bemounted on the housing andthe oil therefrom may drip into'catch cups 63 for It will be noted that the eccentrics are located at the rear end of the casing of the separator, where they are protected from the dust which pervades the interior'of the separator, and they are also protected by their housing from dust in the air externally of the casing. As a consequence, they are immunefrom the attack and injurious effect of such dust and their long life and eflicient operation are insured. i

It will also be noted, that the eccentrics are mounted midway between the sides of the separator anditheir rods are connected to the screens midway between the sides of the 100 separator. Thus a single eccentric and its rod serves to reciprocate each'screen': The connection of the rod with a U-bracketconnected to the longitudinal'bars between the side bars ofthe screen, desirably adds to the strength of the screen'and enables the push and pull of the screen in opposite directions Without injuriousstrain or distortion of the It will be understood that the invention is not limited to the specific embodiment shown, but that various deviations may be made therefrom without departing from the spirit and scope of the appended claims.

'VVhat is claimed is 1. A separator comprising, in combination, a casing, a pair of inclined screensfor grading materials mounted therein, each of said screens having a pair of longitudinal bars between the sides thereof and a bracket bridging and secured to said bars;

a pair of eccentrics, and rods extending from said eccentrics to said brackets to reciprocate said screens.

2. A separator comprising, in combination, a casing, a pair of'inclined screens for grading materials mounted therein, each of said screens comprising a frame, screen clothing stretched thereon, a pair of bars beneath said clothing intermediate the sides of said frame, and a member bridging and secured to said bars; and means to reciproc-ate said screens including a pair of eccentrics mounted at the rear end of said casing externally thereof, rods extending from said eccentrics to and through the bridge members, and springs on said rods at opposite sides of said bridge members to yieldingly transmit movements of said rods to said members.

3. A separator, comprising, in combination, a casing, a pair of inclined screens for grading materials mounted therein, each of said screens comprising a f 'ame for supporting screen clothing, trunnio-ns upon the sides of said frames, upwardly extending, supporting rockers having open bearings receiving said trunnions to removably support the screens in the casing, a bar extending longitudinally of each frame between the sides thereof and secured to the frame beneath the clothing, brackets secured to said bars, rods operatively connected to said brackets, and means for imparting reciprocating movement to said rods to reciprocate the frames.

at. A separator comprising, in combination, a casing, a pair of inclined screens for grading materials mounted therein, each of said screens comprising a frame, screen clothing stretched thereon, a bar beneath the clothing of each frame and positioned longitudinally of the frame and intermediate the sides thereof, a bracket secured to the longitudinally-extending bar of each screen, a shaft, a pair of eccentrics thereon, and rods operatively connected to said eccentrics, and brackets to reciprocate the screens.

In testimony whereof I have signed my name to this s ecification.

TH MAS J. STURTEVANT. 

